By Jose Moreira
Offering an entire creation to the cutting-edge in high-speed electronic checking out with computerized try gear (ATE), this functional source is the 1st booklet to concentration solely in this more and more very important subject. that includes transparent examples, this one-stop reference covers all serious elements of the topic, from high-speed electronic fundamentals, ATE instrumentation for electronic functions, and try and measurements, to construction checking out, aid instrumentation and textual content fixture layout.
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Extra resources for An Engineer's Guide to Automated Testing of High-Speed Interfaces
At-Cycle Source Synchronous Interfaces At-cycle source synchronous interfaces transmit a clock signal together with the signals of the data bus. For wide data busses, at-cycle source synchronous interfaces usually divide the bus into subbusses and one clock signal is transmitted together with the signals of each subbus. At the receiving High-Speed Digital Basics 41 device, the received clock signal is directly used to latch the associated data signals. For at-cycle source synchronous interfaces, there is a one-toone phase relationship (isochronous timing) between the clock and the data signals.
The generated current is converted via the loop filter impedance Z(s) into an average voltage that is fed into a voltage controlled oscillator (VCO). The VCO converts the voltage at its input into a proportional output frequency that serves as output of the PLL as well as input to the feedback loop of the PLL. The N counter (divider) shown in this figure provides the capability to derive other frequencies than just the one defined by the reference signal. With a frequency division of N in the feedback loop, it is possible to create a high-frequency clock that is synchronized with a reference clock that has a 1/N frequency of the output clock.
3 . 2, the data eye diagram does not allow the identification of the individual bits in the bit pattern. However, showing all the bits folded into a single UI allows the easy visualization of the quality of the digital signal. This is because both the 1 One unit interval (UI) corresponds to the period of one bit and is sometimes also referred to as the bit period. For example, in a 10-Gbps data signal the UI is 100 ps. I. 3 Construction of the data eye diagram from a digital waveform. 4. In the figure two different waveforms are displayed, and although it is not easy to compare the performance of both digital signals when looking at the full waveforms, using the data eye diagram it is obvious that waveform 2 is worse than waveform 1.
An Engineer's Guide to Automated Testing of High-Speed Interfaces by Jose Moreira